Story #15026

Updated by Tom Clegg 6 months ago

Provide an arvados-server "cloudtest" subcommand (lib/cloud/test) that uses the configured credentials (from cluster config file) to verify that
* the selected driver implements the cloud.Driver interface properly (empty and non-empty instance tag sets; no implicit filtering of instances list; Instances() includes the new instance if called immediately after Create() returns success; Destroy() works)
* the cloud provider accepts the configured credentials
* resulting VMs accept the configured SSH private key and run commands as root

This has three two main uses:
# Dev tests when creating/modifying a driver
#
CI tests
# Verify/debug verify/debug config while creating/updating a real cluster

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